Few issues are more emotional, and therefore vulnerable to bad analysis, than urban crime risk. Solid research indicates that more compact and mixed development tends to increase neighborhood security. Jane Jacobs was right!

We hear a lot about how restrictive land use regulations and the efforts of NIMBYs hold back new housing in central areas. But according to Richard Florida, density advocates may want to widen their focus.

Parsing a report by urban housing economist Issi Romem, Florida writes that many urban cores are developing and densifying. "Romem argues that America's real housing problem—and a big part of the solution to it—lie in closer-in single-family-home neighborhoods that were built up during the great suburban boom of the last century, and that have seen little or no new housing construction since they were initially developed."

Using Los Angeles as a case study, Romem goes through how American cities became seas of single-family housing. Florida argues that easing restrictive zoning rules in inner suburbs "would spread population growth more equitably and sustainably across a metro, relieving the pressure of rising housing prices and gentrification around the urban core, and unsustainable growth at the periphery."

"'The dormant suburban sea is so vast that if the taboo on densification there were broken,' Romem writes, 'even modest gradual redevelopment—tearing down one single-family home at a time and replacing it with a duplex or a small apartment building—could grow the housing stock immensely.'"

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